New warnings in plgsql/src/scan.l

I see new warnings in the generation of plpgsql's scanner:

/usr/bin/flex -Pplpgsql_base_yy -o'/pg/source/00orig/src/pl/plpgsql/src/pl_scan.c' /pg/source/00orig/src/pl/plpgsql/src/scan.l
/pg/source/00orig/src/pl/plpgsql/src/scan.l:198: warning, the character range [-ÿ] is ambiguous in a case-insensitive scanner
/pg/source/00orig/src/pl/plpgsql/src/scan.l:198: warning, the character range [-ÿ] is ambiguous in a case-insensitive scanner
/pg/source/00orig/src/pl/plpgsql/src/scan.l:320: warning, the character range [-ÿ] is ambiguous in a case-insensitive scanner

I think those have to do with E'' handling changes. I remember there
were similar problems in the main scanner as well some time ago, not
sure about the resolution.

--
Alvaro Herrera (<alvherre[a]surnet.cl>)
"I personally became interested in Linux while I was dating an English major
who wouldn't know an operating system if it walked up and bit him."
(Val Henson)